Is This Verdigris, Should I Dip In Acetone?

Verdigris isn't always dry, and PVC plasticizer reactions tend to be milky rather than green on copper. So by all means get it into acetone to start - every coin, always, in my opinion - but expect it to warrant more specific attention to arrest the verdigris. If it's just PVC, by the time it looks like this there's metal missing underneath and although it's anecdotal I've yet to see a copper coin that badly eaten by it. The stuff likes the taste of silver better.

At this distance in time, I think any chemical problems you might have had with your storage methods would have shown itself. You should be fine.